Comment on YSK that if your turn signal is blinking unusually fast (like 3 or more times a second), it generally means you have a bulb out.

Mac@mander.xyz ⁨11⁩ ⁨months⁩ ago

This "hyperflash"ing will also happen if you have replaced an incandescent bulb with an LED bulb due to the different power requirements.
LEDs draw so much less power that they don’t draw enough current through the flasher relay. The relay will then think that the bulb is burned out.
To fix hyper flash due to having installed LED bulbs you can wire a resistor inline or replace the flasher unit with a unit designed for LED bulbs.

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